Lectin

For example, gluten is a classic example of these things.

There's a group of molecules that are collectively referred to as lectins, and if you've heard the term L-E-C-T-I-N-S, and they're basically defensive molecules.

So yeah, a lot of people can react to so-called natural substances, and that's not an appropriate distinction to make, natural versus not natural, or natural versus synthetic, if you're concerned about reactions.

Because there's a whole wealth of, an abundant amount of natural substances that people can react to, and fragrances or essential oils are just one of them.

Like I can't put a left-hand glove on my right hand, right? Because they're mirror images of each other.

So chirality is mirror images.

So as it turns out, all chemistry, biochemistry, and by extension, cosmetic chemistry, hopefully, in terms of active ingredients anyway, is based on how...

A molecule interacts with a cell.